Prenatal vitamins vary a lot. There’s no federal standard for what they must contain, so two bottles with the same label can be very different inside. This guide answers the questions moms ask most, using guidance from the National Institutes of Health (NIH), the CDC, and the American College of Obstetricians and Gynecologists (ACOG).

The short version

  • Take one every day, starting before pregnancy if you can. ACOG recommends a daily prenatal vitamin for pregnant women, and the CDC recommends 400 micrograms (mcg) of folic acid a day for anyone who could become pregnant.
  • Check the label for 4 things: folic acid (not only methylfolate), iron, iodine, and choline. Many prenatals leave out at least one.
  • Gummies often skip iron and calcium. If you take one, ask your provider whether you need those separately.
  • Store brand or prescription? Neither is automatically better. A prescription can make it eligible for insurance coverage.
  • Look for an independent testing seal (USP, NSF, or ConsumerLab). What’s in the bottle doesn’t always match the label.

What a prenatal vitamin should contain

These are the nutrients the NIH highlights as most important in pregnancy and most likely to be missing or low. Amounts are the daily need during pregnancy for women 19 and older, from the NIH.

Nutrient Daily need in pregnancy What to look for on the label
Folic acid 600 mcg DFE total from food and vitamins The words “folic acid,” usually 400 to 800 mcg. Most prenatals have 800.
Iron 27 mg About 27 mg. Most prenatals have it; many gummies don’t.
Iodine 220 mcg About 150 mcg. About 1 in 4 prenatals have none.
Choline 450 mg Any amount. Fewer than half of prenatals include it, usually only about 25 mg.
Vitamin D 15 mcg (600 IU) Check that it’s listed.
Calcium 1,000 mg Prenatals usually have only about 200 mg, so most of your calcium has to come from food.

A few notes on the less familiar ones:

  • Iodine helps make thyroid hormones, which your baby’s brain needs to develop. The American Thyroid Association recommends a supplement with 150 mcg of iodine a day for women who are pregnant or planning to be.
  • Choline supports your baby’s brain and spinal cord. Most pregnant women in the U.S. don’t get enough; only about 8% reach the recommended amount. Eggs, meat, fish, and dairy are the best food sources.
  • DHA is an omega-3 fat important for your baby’s brain and eyes. Many experts recommend 8 to 12 ounces a week of seafood that’s low in mercury, such as salmon, sardines, or trout. If you don’t eat fish, ask about a DHA supplement.

What you don’t need: extra vitamin A in the form of retinol or “preformed” vitamin A. Too much can cause birth defects. And many prenatals now include herbs or probiotics, most of which haven’t been well studied in pregnancy.

Choosing one

Store brand or prescription?

Neither is automatically better. According to the NIH, a 2017 comparison of labels found:

  • Prescription prenatals had more folic acid on average, but fewer vitamins and minerals overall (about 9 vitamins and 4 minerals).
  • Store-brand prenatals had more vitamins and minerals overall (about 11 and 8), and more iodine, calcium, and vitamins A and D.

The practical difference is often cost: a prenatal your provider prescribes can be eligible for insurance coverage. Whichever you choose, compare the label with the table above.

Do gummies count?

They can, but read the label carefully. Gummy prenatals often contain no iron or calcium, according to the NIH. If you prefer gummies because pills are hard to swallow or make you queasy, ask your provider whether you need a separate iron supplement.

Folic acid or methylfolate?

Some prenatals use a form of folate called methylfolate (also listed as 5-MTHF or L-methylfolate) instead of folic acid. About 1 in 4 store-brand prenatals and 1 in 3 prescription ones do. Methylfolate hasn’t been tested in clinical trials for preventing neural tube defects; folic acid is the only form proven to lower that risk, and the CDC recommends folic acid even for people with an MTHFR gene variant. If your prenatal lists only methylfolate, ask your provider about it.

Does the brand matter?

Quality does. In a 2023 federal review of 12 over-the-counter prenatal vitamins, 11 had at least one nutrient outside acceptable limits compared with the label, and 6 had trace amounts of lead or cadmium, though not at levels the FDA considers a health concern. Products tested by an independent group such as U.S. Pharmacopeia (USP), NSF, or ConsumerLab are more likely to contain what the label says and to be free of harmful contaminants, according to the NIH. Look for their seal on the bottle.

Taking it

When should I start?

Before pregnancy, if you can. Folic acid protects your baby’s brain and spine in the first 28 days after conception, often before you know you’re pregnant, so the U.S. Preventive Services Task Force recommends starting at least 1 month before you try. For iodine, the American Thyroid Association suggests starting about 3 months before. If you’re already pregnant and haven’t started, start now.

What time of day, and with food?

There’s no best time; pick the one you’ll remember. Taking it with a meal is fine for folic acid: your body still absorbs most of it, according to the NIH. If you also take a separate calcium supplement, take it at a different time of day from your prenatal or iron pill, since calcium can interfere with iron absorption.

My prenatal makes me queasy. What can I do?

Don’t just stop. Ask your doctor or midwife about switching products or forms. Taking a vitamin around the time you conceive may make nausea less severe, according to ACOG, and our article on vitamin B6 for morning sickness covers treatment options.

I forgot to take it yesterday. Does that matter?

Protection comes from the daily habit over weeks and months. Take your next dose as usual. Don’t take two at once to make up for it; doubling up raises the amount of iron, vitamin A, and other nutrients you get that day. If you miss doses often, try keeping the bottle where you’ll see it at the same time each day, or set a phone reminder.

How long should I keep taking it?

Through your whole pregnancy. After birth, the CDC’s recommendation of 400 mcg of folic acid a day still applies to anyone who could become pregnant again. If you’re breastfeeding, the Dietary Guidelines for Americans recommend asking your provider whether to continue your prenatal or switch to another supplement.

Can I take other supplements with it?

Check with your provider first, and add up the totals. Going over is common: about 28% of pregnant women in the U.S. get more iron than the upper limit of 45 mg a day once food and supplements are counted, according to the NIH. A prenatal plus a separate multivitamin or folic acid pill can push several nutrients too high.

Cost and insurance

Store-brand prenatal vitamins are sold without a prescription and are usually inexpensive. If cost is a concern, ask your provider to prescribe one: a prescribed prenatal can be eligible for health insurance reimbursement, according to the NIH. Check with your plan about what it covers.

If you qualify for WIC, the program provides healthy foods, nutrition education, and breastfeeding support during and after pregnancy. See our list of pregnancy resources.

Special situations

I’m on birth control. Do I still need folic acid?

Yes, if you could become pregnant. The CDC recommends 400 mcg of folic acid a day for anyone who could become pregnant, because about half of U.S. pregnancies are unplanned and folic acid has to be in place before pregnancy starts. You don’t need a full prenatal vitamin for this; a regular multivitamin with 400 mcg of folic acid works.

I’m vegetarian or vegan.

Your prenatal matters more, and a few nutrients need extra attention, according to the NIH:

  • Vitamin B12 comes naturally only from animal foods. Make sure your prenatal or another supplement includes it; your baby depends on your supply, during pregnancy and while breastfeeding.
  • Iron from plants is absorbed less well. The Academy of Nutrition and Dietetics suggests 30 mg a day for pregnant vegetarians and vegans, from a prenatal, a separate supplement, or both.
  • Iodine and choline are harder to get without dairy, eggs, and seafood. The Dietary Guidelines recommend asking your provider whether you need supplements.
  • DHA from algae-based supplements is an option if you don’t eat fish.

I’ve had a pregnancy affected by a neural tube defect.

Talk with your doctor before you try again. The CDC recommends 4,000 mcg of folic acid a day, starting 1 month before pregnancy and continuing through the first 3 months, under a doctor’s care. Don’t try to reach that dose by taking several prenatal vitamins; you’d get too much of the other nutrients in them.

I take other medicines.

Bring your prenatal to your next appointment along with your other medicines. Some, including certain seizure medicines and methotrexate, affect folate, and your doctor may recommend a different plan.

What to do now

  • Read the label on your prenatal: look for folic acid, iron, iodine, and choline.
  • Check for a USP, NSF, or ConsumerLab seal.
  • Add up anything else you take, so you aren’t doubling up.
  • Take your prenatal and other supplements to your next appointment and ask, “Is this the right one for me?”

Related reading

Sources

Updated October 2026. This article is for general information and is not a substitute for advice from your health care provider.